Respiratory tract
The Respiratory Tract is lined with epithelium which move the mucus up towards the mouth in a sweeping motion. Once the mucus has reached the mouth it is swallowed via the oesophagus.
The Respiratory Tract is lined with epithelium which move the mucus up towards the mouth in a sweeping motion. Once the mucus has reached the mouth it is swallowed via the oesophagus.